LMR24210,LMR24220,LMZ10501
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1 LMR24210,LMR24220,LMZ10501 Application Note 2193 LMR24220 Multi-Rail Reference Board Literature Number: SNVA505
2 LMR24220 Multi-Rail Reference Board Introduction The LMR24220 Multi-Rail reference board implements an extremely compact solution. It is designed to convert from 12V or 24V rails down to typical point-of-load voltages of 3.3V, 1.8V and 1.2V. This design utilizes an LMR24220 Nano Regulator and two LMZ10501 Nano Modules to demonstrate a complete solution for space constrained multi-rail applications. The LMR24220 Nano Regulator is ideal for intermediate rail conversions and can withstand input voltages up to 42V. It uses a constant on-time (COT) with emulated ripple mode architecture that requires no loop compensation and allows the use of low ESR ceramic capacitors. To further reduce conducted noise on the input supply a pi filter has been implemented on the LMR The LMZ10501 Nano Module is ideal at the point-of-load and uses a current mode architecture combined with an integrated inductor for high efficiency, low noise, and low EMI. The complete solution size is x x 2mm with all components placed on a single side. The board can be plugged into a standard 8-pin header with 100 mil spacing and total thickness less than 100mils for ease of prototyping. Features 5V to 32V Input Voltage Range 3.3V / 1.8V / 1.2V Output Voltage Rails Up to 1000 ma Output Current Per Rail Small Solution Size (20.32 x x 2mm) No External Compensation Required Top View National Semiconductor Application Note 2193 Marc Davis-Marsh September 22, 2011 Shutdown Operation FIGURE 1. LMR24220 Multi-Rail Reference Board The reference board includes a resistor divider that implements an Under Voltage Lockout (UVLO) that disables the part when V IN is below 4V. The threshold for the UVLO can be adjusted to suit the needs of the application. Ret = (V UVLO * 10K K) The midpoint of the resistor divider is clamped to 4.3V by diode D2 so that the EN pin voltage of the LMR24220 does not exceed 7V. The midpoint is also tied to pin 8 of the header (EN). Use the EN pin to disable the device by pulling this node to GND. A logic signal may be applied to the post to test startup and shutdown of the device. Adjusting the Output Voltage The output voltage on the LMR24220 can be changed from 3.3V to another voltage by adjusting the feedback resistors using the following equation: R1 = [(V OUT / V FB ) -1] *R2 Where V FB is 0.8V. The output voltage of either LMZ10501 can be changed from 1.8V/1.2V to another voltage by adjusting the feedback resistors using the following equation: RB = [V OUT / ( V OUT )] * RT For more information on component selection and features see the LMR24220 and LMZ10501 datasheets. Bottom View 2011 National Semiconductor Corporation LMR24220 Multi-Rail Reference Board AN-2193
3 AN FIGURE 2. LMR24220 Reference Board Schematic Bill of Materials (BOM) LMR24220 Designation Description Size Manufacturer Part # Vendor U1 LMZ10501 SE08A LMZ10501SEX National U2 LMR ball µsmd LMR24220TLX National U3 LMZ10501 SE08A LMZ10501SEX National C10 Cap 10nF 25V X7R 0402 C1005X7R1E103K TDK Cbt, Ci2a, Co2a Cap 0.047µF 50V X7R 0603 GRM188R71H473KA61D Murata Cc1, Cc3 Cap 1000pF 25V X7R 0201 GRM033R71E102KA01D Murata Ci1a, Ci3a, Co1a, Co3a Cap 4.7µF 6.3V X5R 0603 C1608X5R0J475M TDK Ci2b, Ci3b Cap 10µF 35V X5R 1206 GRM31CR6YA106KA12L Murata Ci2b, Ci3b (alt) Cap 10µF 50V X5R 1210 UMK325BJ106MMT Taiyo Yuden Co2b, Co2c Cap 47µF 6.3V X5R 1206 C3216X5R0J476M TDK Css Cap 22nF 16V X7R 0402 C1005X7R1C223K TDK Cvcc Cap 1µF 25V X7R 0805 GCM21BR71E105KA56L Murata D1 LED, Blue, SMD 0402 LNJ947W8CRA Panasonic D2 Zener Diode 4.3V 200mW SOD-523F MM5Z4V3 Fairchild L1 Shielded Inductor 6.8µH 2.4A (5.49mm x 5.18mm x 2.00mm) L2 LTCC Inductor 2.2µH 0.9A (2.50mm x 1.50mm x 1.20mm) IHLP2020BZER6R8M01 CPL2512T2R2M Vishay-Dale Vishay-Dale R1 RES, 6.81k ohm, 1%, 0.063W 0402 CRCW04026K81FKED Vishay-Dale 2
4 Designation Description Size Manufacturer Part # Vendor R2 RES, 2.21k ohm, 1%, 0.063W 0402 CRCW04022K21FKED Vishay-Dale Reb RES, 12.4k ohm, 1%, 0.063W 0402 CRCW040212K4FKED Vishay-Dale Ret RES, 28.0k ohm, 1%, 0.063W 0402 CRCW040228K0FKED Vishay-Dale Ron RES, 76.8k ohm, 1%, 0.063W 0402 CRCW040276K8FKED Vishay-Dale Rb, Rb3 RES, 82.5k ohm, 1%, 0.063W 0402 CRCW040282K5FKED Vishay-Dale Rt RES, 187k ohm, 1%, 0.063W 0402 CRCW KFKED Vishay-Dale Rt3 RES, 316k ohm, 1%, 0.063W 0402 CRCW KFKED Vishay-Dale Rled RES, 332 ohm, 1%, 0.063W 0402 CRCW RFKED Vishay-Dale J " (2.54mm), Surface Mount Header, 1x8, Gold plated,right Angle J " (2.54 mm) Female Header: 1x8-Pin, Straight AR-PR AR 3M 3M AN
5 AN-2193 Test Setup Bottom View Pin Descriptions Pin Name Description 1 3.3V 3.3V Output Voltage Output from the LMR24220 (U2). Supplies current to both the LMZ10501s and any external load. Total Current up to 1.5Amps without airflow. 2Amps with airflow. 2, 4, 6 GND Ground Reference point for all stated voltages. 3 VIN Input supply Nominal operating range is 5V to 32V. To increase the maximum operating voltage of the design to 42V, use the alternate Ci2b, and Ci3b capacitors called out in the BOM V 1.2V Output Voltage Output from the LMZ10501 (U1). Load current up to 1A V 1.8V Output Voltage Output from the LMZ10501 (U3). Load current up to 1A. 8 EN Enable Input to the LMR24220 precision enable comparator. Rising threshold is 1.274V typical. Leave floating to allow the resistor divider to enable the reference board when V IN exceeds 4V. Demonstration Board Quick Setup Procedures Step Description Notes 1 Connect a power supply to V IN terminal V IN range: 5V to 32V 2 Connect a load to 3.3V / 1.8V / 1.2V terminals I OUT range: 0A to 1.0A 3 EN should be left floating for normal operation. Short this to ground to shutdown the part 4 Set V IN = 12V, with 0A load applied, check 3.3V / 1.8V / 1.2V rails with a voltmeter 5 Apply a 1.0A load to any rail and check 3.3V / 1.8V / 1.2V rails with a voltmeter 4
6 Typical Performance Characteristics Efficiency vs. Load Current LMR24220, V OUT = 3.3V 90 Efficiency vs. Load Current LMZ10501, V OUT = 1.2V 100 AN-2193 EFFICIENCY (%) VIN = 12V VIN = 24V EFFICIENCY (%) VIN = 3.3V LOAD CURRENT (A) LOAD CURRENT (A) Efficiency vs. Load Current LMZ10501, V OUT = 1.8V Startup Waveform EFFICIENCY (%) VIN = 3.3V LOAD CURRENT (A) Output Ripple 2.00 Output Power Tradeoff V RAIL MAXIMUM LOAD (A) No Airflow. 85C Max Junction Airflow V AND 1.8V RAILS TOTAL OUTPUT POWER (W)
7 AN-2193 Layout Top Layer Top Overlay Mid Layer1 (GND)
8 AN-2193 Mid Layer2 (3.3V) Bottom Layer Bottom Overlay
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